Apparatus for the application of wax onto grinding, polishing wheels and the like



1964 J. G. LUNDIN ETAL 3,143,294

APPARATUS FOR THE APPLICATION OF WAX ONTO GRINDING, POLISHING WHEELS AND THE LIKE Filed Oct. 26, 1961 INVENTORS' J ahan GwVKa-R Lyn din PM 0%? Siv m' Pawn -man United States Patent Office:

Fatented Aug. 4, 1964 3,143,294 APPARATUS FOR THE APPLICATHGN F WAX ONTO GRINDING, POLISHING WHEELS AND THE LIKE 1 Johan Gunnar Lundin, Nybohovsbackeu 103, Stockhohn,

Sweden, and Per 010v Sivert Penngard, Sandfjardsgatan 120, Johanneshov, Sweden Filed Oct. 26, 1961, Ser. No. 147,788 Claims priority, application Sweden Aug. 4, 1961 1 Claim. (Cl. 239-135) The present invention relates to a method for applying solid or semi-solid abrasive or polishing waxes with or without mixed in abrasive onto grinding or polishing tools, such as grinding wheels, grinding rolls, polishing wheels, polishing rolls and the like or directly onto such objects which are to be ground or polished.

Within the grinding and polishing technics one has more and more appreciated the advantage of solid or semi-solid grinding or polishing waxes in contradistinction to liquid polishing waxes. The first mentioned kind of wax is namely of particular advantage out of the point of view, that it is possible to distribute in said wax in a homogeneous way grinding or polishing agents without encountering any tendencies to Stratification.

Hitherto with grinding or polishing one frequently in a manual way urged pieces of such solid or semi-solid waxes against grinding, polishing wheels or such objects which were to be ground or polished. There are, however, encountered certain risks for the pieces of wax to be wrenched out of the hand and being vigorously thrown out in a work shop involving risks of injuries. Moreover, for natural reasons, it is always necessary to have a sufiicient piece of the wax left in order to be able to retain it which means that this last piece of the wax is wasted which obviously constitutes a squandering of the material.

It was also previously suggested to secure the pieces of Wax in retainers arranged in guides or other systems in the machine proper. Also in such respects a relatively large piece of the wax used is required for anchoring it in the retainer which thus also involves a wasting of material.

Common to both indicated methods of application of the wax in addition to the above mentioned inconveniences is also the fact that the application of wax may not take place in a regular way with regard to distribution which also may affect the grinding or polishing process proper.

Said inconveniences are, however, removed by the invention which is substantially characterized therein that the wax is heated to a predetermined suitable consistency and that this consistency is maintained and that the wax thus treated is subjected to the action of a jet of gas or air adjustable to its intensity in such a way that particles of wax of a size being a function of the temperature of the wax and the intensity of the jet of gas or air are thrown into contact with the tools or objects either intermittently or continuously.

The invention also relates to an apparatus for carrying out the method which is substantially characterized by a container for receiving grinding or polishing waxes which is provided with a source of the heat which is controlled by a means for maintaining the temperature of the container and along with it the wax constant, and

a traversing duct leading from the container to a traversing zone for a jet of gas or air, the intensity thereof being adjustable.

The invention will be more clearly explained below with reference to a diagrammatically shown embodiment of it and in connection therewith further features of the invention will be set forth.

The drawing illustrates in a diagrammatic way a longitudinal section through an apparatus according to the invention for carrying out the method according to the invention.

In the drawing the bottom part of a container for molten wax, such as grinding or polishing wax, band wax or the like, is designated by 1 the uppermost walls of which are designated by 2. The bottom part 1 is heated by electric means consisting of a resistance designated by 4 which by way of lines 5, 6 and a control means such as a potentiometer 7 respectively is connected to a source of current 8. By this arrangement the container may be kept at a predetermined temperature as controlled by the potentiometer 7, whereby the wax 3 at least in the lowermost part of the container designated by 9 is maintained at a suitable consistency for carrying out the method. Leading through the bottom of the block 1 to the bottom part 9 is an open duct it in which is inserted a sleeve 11 open at both ends through the channel 12 of which the wax may pass out into a traversing zone or expansion chamber 1.3 for air or gas. The sleeve 11 is retained in position by a threaded connection 14 in the block 1.

Introduced in the block 1 is an annular flange 15 of an additional block 16 by which the sleeve 11 is enclosed.

The block 16 in association with the traversing zone 13 presents a diffuser-shaped opening or diverging gaswax mixing chamber 17. Mounted for displacement in the block 16 is a piston 18 to the forward end of which is fixed a valve body 19 which by means of a compression spring 20 disposed in the piston 18 and acting against a cover 21 is arranged to cooperate with the mouth of the sleeve 11 in such a way that this month is normally kept closed preventing wax to discharge into the traversing zone 13. From a source not shown of for instance compressed air flows into said zone 13 by way of a reduction valve designated by 22 and under control of an operating valve 23 over an air duct 24 in the block 16. This air duct 24 on one hand leads via a duct 25 into a space 26 in front of the piston 18 and on the other hand through a duct 27 into a nozzle 28 which is placed in the upper portion of the traversing zone 13.

The arrangement operates in the following way: From the very beginning grinding or polishing wax, band wax or the like 3 is placed in the container 1 and heated to such an extent that the wax will fill out the bottom 9 and the hole 12 in the sleeve 11 up to the shutting valve body or circular valve disc 19. The potentiometer 7 is thereby set in such a way that the container and along with it the wax is kept at a predetermined temperature providing a desired consistency for the continued use. After this has occurred the operating valve 23 is operated in such a Way that a flow of gas or air at a desired pressure will pass into the duct 24 while being branched off to the piston space 26 and simultaneously into the air nozzle 38. This results in the piston 18 being urged rearwardly toward the wall 21. against the action of the compression spring Zil, the valve body 19 at the same time leaving its seat in the mouth of the sleeve 11. Thereby a wax surface at the end of the duct 12 is exposed and subjected to the action of the jet of air flowing through said zone 13 at a relatively high velocity. The wax is entrained in the air and suitably distributed in dependence of its temperature and the intensity of the flow of air through the nozzle 17 and for instance forcibly transmitted against a grinding wheel, polishing wheel or the like designated by 29 or against the object proper which is to be subjected to grinding or polishing.

By the new arrangement and method it is now possible to utilize the total quantity of the wax instead of only part thereof as with the previously known methods. Moreover due to the control means of the source of heat 4 it is possible to maintain the wax at the exact consistency which is advantageous for having it distributed in the most regular way in the jet of air passing through the traversing zone 13. The arrangement may be used continuously or intermittently and also in an automatic Way if this would be desirable with regard to the operation of the operating valve 23.

Since the wax contains abrasive or polishing agents there is a certain risk involved in wearing down the elements present in the traversing zone such as the end of the sleeve 11 and the valve body 19 and also the walls of the traversing zone 13 and diffuser shaped part 17 for which reason it is preferable in certain applications to make the entire arrangement or only parts thereof from more resistant material such as hard metals of diiferent kinds. The entire arrangement shown can be shaped as a built-in unit for grinding and polishing machines or also be self-supporting possibly provided with a suitable frame.

The invention is not limited to the embodiment shown and described but may be varied in various ways Within the scope of the basic inventive idea.

Having now described the invention, what we claim as new and desire to secure by Letters Patent is:

In an apparatus for the application of grinding and polishing wax compositions onto grinding and polishing tools and the like, a jet nozzle for supplying gas under pressure therethrough from a source of gas pressure, an expansion chamber adjacent said jet nozzle and in communication therewith, said expansion chamber being substantially larger in diameter than the diameter'of said nozzle, 21 thermostatically heated container for holding solid wax composition therein and heating it into a 11 -11 liquified state, a duct connected to said container at one end, the other end of said duct extending within said expansion chamber a substantial distance and being disposed substantially at right angles with the main axis of said expansion chamber so as to supply wax composition to said chamber at a right angle with respect to the direction of flow of said jet of gas .under pressure, a cylinder disposed in alignment with said other end of said duct piston means in said cylinder, a circular valve disc carried by the end of said piston adjacent said another duct end and adapted to shut off flow of wax through said duct, said valve disc being disposed within said expansion chamber, spring means in said cylinder for normally holding said valve disc in a seated position, conduit means in communication with said cylinder on one side of said piston means for communicating with a source of pressure to supply gas pressure to'move said piston means and valve disc to an unseated position, valve means for controlling the flow of gas under pressure to said jet nozzle and through said conduit means to said cylinder for regulating the unseating of said valve disc, and a diverging gas-Wax mixing chamber adjacent to and communicating with said expansion chamber for discharging a dispersion of gas and wax from said apparatus.

References Cited in the file of this patent UNITED STATES PATENTS 1,587,736 Schenck June :8, 1926 2,155,932 Davis Apr. 25, 1939 2,283,969 Buttner May 26, 1942 2,817,600 Yahnke Dec. 24, 1957 

